Two series of JET shots, one on hot ion shots and one on hot electron shots, have
been analysed in order to improve the understanding of how the temperature
ratio Te/Ti influences the performance. Comparisons are also made with ITER
simulations which are in the hot electron regime. The temperature ratio has
been varied between different shots, in partly interpretative simulations of one
shot and locally. The effect of the variation of the temperature ratio depends
strongly on how it is done but can also be different in different types of shots.
general, however, an increased electron heating deteriorates confinement rather
strongly. This is the situation for increasing the alpha power in ITER. ITER
simulations show, however, that the effect is not dramatic. |